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LP2951-4.8 View Datasheet(PDF) - Micrel

Part NameDescriptionManufacturer
LP2951-4.8 100mA Low-Dropout Voltage Regulator Micrel
Micrel Micrel
LP2951-4.8 Datasheet PDF : 14 Pages
First Prev 11 12 13 14
LP2950/2951
+V = 2 30V
IL
LOAD
1.23
IL= R
8
VIN
VOUT 1
LP2951
SHUTDOWN 3
SD
INPUT
GND FB
4
7
R
1%
1µF
0.1µF
Low Drift Current Source
+V IN
Micrel
+V IN
VOUT
LP2950Z
GND
*VOUT = 5V
+
1µF
5 Volt Current Limiter
* MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV TO 400mV,
DEPENDING ON LOAD CURRENT.
+V IN
D1
3
8
+V IN
2
SENSE
VOUT 1
LP2951
#1
5
ERROR
GND
4
27k
2.7M
D4
D3
D2
MEMORY
V+
20
1µF
3.6V
NICAD
EARLY WARNING
Q1
8
2
+VIN SENSE
VOUT 1
LP2951
3 SD
#2 ERROR 5
GND
4
330k
MAIN
OUTPUT
RESET
µP
VDO
+
1µf
Regulator with Early Warning and Auxiliary Output
• EARLY WARNING FLAG ON LOW INPUT VOLTAGE
• MAIN OUTPUT LATCHES OFF AT LOWER INPUT VOLTAGES
• BATTERY BACKUP ON AUXILIARY OUTPUT
OPERATION: REG. #1’S VOUT IS PROGRAMMED ONE DIODE DROP ABOVE 5 V.
ITS ERROR FLAG BECOMES ACTIVE WHEN VIN 5.7 V. WHEN VIN DROPS
BELOW 5.3 V, THE ERROR FLAG OF REG. #2 BECOMES ACTIVE AND VIA Q1
LATCHES THE MAIN OUTPUT OFF. WHEN VIN AGAIN EXCEEDS 5.7 V REG. #1
IS BACK IN REGULATION AND THE EARLY WARNING SIGNAL RISES,
UNLATCHING REG. #2 VIA D3.
February 1999
3-45
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